JOURNAL ARTICLE
OBSERVATIONAL STUDY
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Physical activity initiated by employer induces improvements in a novel set of biomarkers of inflammation: an 8-week follow-up study.

PURPOSE: We investigated the level of pro- and anti-inflammatory biomarkers before and after 8 weeks of unsupervised physical activity (PA) initiated by employer.

METHODS: During autumn 2014, background data, blood samples and self-reported exercise level were collected from 76 men and 41 women in a Norwegian road maintenance company. Monocyte chemoattractant protein-1 (MCP-1), tumor necrosis factor-alpha (TNF-α), interleukin-6 (IL-6), leptin, adiponectin, p-selectin and CD40 ligand (CD40L) were analyzed. [Formula: see text] was measured in a subgroup of 50 subjects.

RESULTS: With reference point of exercise ≤1 time/week, we found that participants who exercised 2-3 times/week had higher [Formula: see text] values (5.6 mL kg-1  min-1 ; 95% CI [1.3, 9.9]). MCP-1 was lower in those who exercised ≥ 4 times/week (-81.98 pg/ml [-142.9, -21.0]). IL-6 and p-selectin levels were lower in females who exercised ≥4 times/week (-1.04 pg/ml [-2.04, -0.03] and -13.75 ng/ml [-24.03, -3.48]). Leptin was lower in participants who exercised 2-3 times/week (-0.39 µg/ml ln [-0.68, -0.09]) and ≥4 times/week (-0.69 µg/ml ln [-1.10, -0.28]). During follow-up, [Formula: see text] increased (2.9 mL kg-1  min-1 [1.5, 4.3]), while p-selectin and CD40L decreased (-2.33 ng/ml [-3.78, -0.87] and 718.14 ng/ml [-1368, -68]). MCP-1 levels decreased among men (-32.70 pg/ml [-51.21, -14.19]). A joint analysis of all biomarkers (inversed adiponectin) showed that those who exercised ≥4 times/week at baseline had lower total levels of biomarkers and that total biomarker levels decreased during follow-up.

CONCLUSIONS: Exercising several times a week was associated with less inflammation compared to exercising once a week or less. During the 8-week follow-up, total levels of biomarkers of inflammation improved.

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